Hey fellas, about 15 yearas ago I put in a fiberglass tub-shower unit and its been a problem always. Can't clean it properly and it has blisters in the finish. Was this a problem with the process back then? I want to put one in my house and my rental, but at 300. 00 a pop, I need to know what to look for. Manufacturer,process,finish,or products used? This will be the last install for me, I hope! I know someone has knowledge of this, if you would please share. Thanks in advance. Tim